Back when azura's just went no-CP there were basically no AoE in there anymore because most guilds didnt want to play in a no-CP campaign. There were mostly just hordes of pugs in there. AD was pop locked most of the day and DC/EP were on low/med until prime time started (when they usually went to high, sometimes locked)
And guess what, it lagged like crazy when the whole campaign's population was converging to only 1 or 2 places on the map. Because that's exactly what it is... it has everything to do with how spread out the fighting is and very little to do with AoE trains any guilds might be running at that moment.
I get it, fighting AoE trains sucks when youre not a part of one. But blaming the lag on them instead of the fact ZOS is basically dumbing down Cyrodiil to the point where the main campaigns are basically just faction stack vs faction stack is just scapegoating.
I can go to trueflame and when it's lagging so badly I can barely use my abilities there's usually only 1 or 2 giant fighting crosses on the map and nothing else. THAT is the real issue.
First, you say campaigns lag when their pops converge into one spot. True. What do bomb trains do? Make them converge even more. Precisely because bomb trains pride themselves (and rightely so may i add) into killing foes that vastly outnumber them. The better the group, the more pugs needed swarming around to be satisfied. ZS being an excellent bomb group, when they want real challenge they feed on huge swarms.
When there is a massive keep siege, and a bit of lag to go with it, when does the lag really break out? when the inner is breached and everyone stacks inside. Well a bomb squad on a locked campaign is pretty much a moving inner breach.
Not 100% of the time of course, no one is saying that they are purposefuly causing lag, or even always in the middle of huge fights. I know most ZS members are also small scalers and suffer from this as much as any one else. It's just that it seems everyone here is blaming the other side and never does anyone stop to think, well, maybe our behaviour is adding to it and we should stop for a second.
Oh and, don't tell me fighting AoE trains suck because i can't join one.... I've been in some in the past, lead some, and can still today count on a friendlist that would gladly join me in Cyro if I asked them. The thing is that I don't enjoy it, and I even get called a hypocrit for doing it lol (seeing as i'm always criticising large groups, I kinda deserve that ^^)